Patent GB-414705-A (GB)
Title: Improvements in or relating to photographic type composing
IPC: B41B23/00
Filed: 1933-02-08
Abstract: 414,705. Photographic type-composing. UHERTYPE AKT.-GES., Glarus, Switzerland. Feb. 8, 1933, No. 3918. Convention date, Feb. 9, 1932. [Class 98 (i).] In a photographic type-composing process of the kind in which individual reproductions of lines of type matter or other letterpress units are photographed to form a complete representation of the type in its made-up form, the letterpress units are provided on individual loose carriers each having gauging means corresponding to a system of two co-ordinates, the carriers being applied to a support having corresponding gauging means, and the letterpress units are then photographed to produce the final representation. Reproducing apparatus for the process comprises means for feeding a light sensitive carrier past the projection window step by step, means for guiding the support of the letterpress units so that they can be brought successively in front of the projection window and feeding means for the support having means co-operating with the support for accurately locating the letterpress units in the projection window. The carriers 1, Fig. 1, for the letterpress units may be in the form of transparent strips having holes 3, 4 for locating them accurately on the support, and controlling elements e.g. notches 6. The hole 3 is placed at at a constant distance X from the writing line S and a constant distance Y from the left-hand margin of the letterpress R. The supports comprise two strips 17, 18, Fig. 17, e.g. of steel having a series of openings 11 and feed holes 22. The lower support 17 bears pins 5 entering the holes 3, 4 on the carriers and holes on the upper support 18. The supports are connected together by press studs on the support 17 entering holes 21 in the support 18. For checking purposes the support 17 with the carriers is passed through a slide track having observation stations at which any carrier may be removed and replaced by a corrected carrier. In the reproducing machine shown in Fig. 22, the supports 17, 18 are passed through a slide 57 by means of a feed pin 56 driven from a main shaft 49 which also drives, through an adjustable transmission device 64-68 the slide 74 on which the carrier 14 of the lightsensitive material is mounted. A shutter 78 is also driven from the main shaft 49. A magnet 58 is provided for stopping the feed of the supports 17, 18 by withdrawing the feed pin 56, a magnet 82 simultaneously opening a friction clutch 70 in the drive of the sensitized material, the circuit of both magnets being controlled by a switch 85 operated by hand and a time switch 89, 90 which ensures that the stoppage only occurs when the shutter 78 is closed. To limit the feed movement to a predetermined number of steps, a ratchet wheel 95 is provided which is stepped one tooth by the magnet 96 for each revolution of the shaft 49. A pin 104 is inserted in a selected hole 103 in this wheel, and when the pin reaches a crank 106 contact 107 is closed which is equivalent to closing the switch 85. The carrier 14 may be large enough to accommodate several columns of type, which are successively set up by adjustment of the projection window. Several projection windows may also be provided. Hatchings may be superimposed on the letterpress carriers and ornaments or headpieces &c. may also be provided on carriers similar to the carriers of the letterpress units. Portions of these carriers may be screened to permit of forming ornamental patterns &c.